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It's very difficult to change the pH of your body through diet.

Can You Make Your pH More Alkaline?

Your body has a complex system of checks and balances to keep its pH in a normal and healthy range: 7.35 to 7.45. When your pH shifts outside this range and becomes too acidic or too alkaline, your body automatically corrects itself to bring things back to normal by:

- Increasing or decreasing respiration - When you breathe more rapidly, you blow out more carbon dioxide. This raises your pH so it becomes more alkaline and less acidic. Conversely, slowing down your breathing causes you to release less carbon dioxide, which lowers your pH making it less alkaline.
- "Mopping up" excess hydrogen ions - Neutralizing substances in the blood such as bicarbonate and hemoglobin, mop up excess hydrogen ions and prevent pH from becoming too acidic.
- Eliminating the excess - Your kidneys excrete excess acidic substances into urine to prevent pH from becoming too low. Conversely, if your pH starts to become too high or alkaline, the body uses similar tools in reverse to bring down the pH.

The bottom line: The body fights hard to keep your pH balanced. It's nearly impossible to achieve and maintain a high-alkaline pH for a prolonged period of time.

Are Urine and Saliva pH Test Strips a Good Way to measure the Body's pH?

The only way to directly measure the body's pH is by testing your blood. Testing your urine only tells the pH of your urine. Urine is naturally more acidic and has a lower pH (~6.0). Similarly, saliva test strips only measure the pH of your saliva, not the pH of your blood.

...this is the full article (it's not terribly in depth but gives an overview) Alkaline Diets and Cancer: Fact or Fiction?

...here's another brief article Beware of claims that you can change your blood pH